First, let me say that I am a fellow Exhalted enthusiast. It was the first saber from The Forge that I HAD to have. I got it, as opposed to the Redeemer, or Prodigal Son mainly because it did not have the control box, which while aesthetically pleasing, is not very practical for sparring/dueling. That is just my opinion of course, as I am sure there are lots of folks out there who find it no problem at all. However, it was really the grenade section, and the thin-neck emitter that appealed to me the most. I have loved that particular combination since I first saw it on Obi-Wan's saber in "A New Hope" back in 1977 (when it was just "Star Wars" with no episode number or subtitle). You can see from the inserted picture, it turned out well. As for the copper section, I believe you are correct about the recent switch from brass, but perhaps someone else can further confirm.
I know the wait will be tough, but I can tell you from experience that it will be worth it! If you ordered from the main site, you might also be interested to know that yesterday, Kyntiri jumped on the forum and said SF had made progress towards reducing their lead time, so that it was now shorter than Etsy, at about 6-8 weeks. So, the wait may not be as long as you thought!
So, congrats on the order, and keep us updated in it as it progresses through and finally arrives!
BTW, don't be surprised if this thread gets moved to the "Open Topics" section of the forum, as this section is typically for reviews of sabers already received, rather than questions about them. No biggie, but they like to keep a tidy house around the forum.